Backlight Optical Member Structure for Moisture and Light Leakage
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Solution Overview
Problem
Display apparatuses face challenges in achieving improved durability and display quality, particularly in the backlight unit, where issues such as light leakage and moisture penetration affect the performance and longevity of the light conversion layer.
Innovation Solution
The proposed solution involves a display apparatus with a light guide member and an optical member that includes a low refraction layer, a first cover layer, and a light conversion layer. The low refraction layer is positioned on the light output surface of the light guide member and has side surfaces, with the first cover layer surrounding at least a portion of these side surfaces to prevent moisture and air from penetrating and deteriorating the light conversion layer. The light conversion layer, which may include quantum dots, is designed to convert the wavelength band of incident light, and additional cover layers provide further protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light conversion layer is exposed to improve light conversion efficiency, then display quality is improved, but moisture and air penetrate and deteriorate the light conversion layer
Solution Approach 1:
The patent applies a multi-layer thin film cover structure consisting of a first cover layer, second cover layer, and third cover layer that conformally coats the low refraction layer and light conversion layer. These flexible thin films provide comprehensive protection against moisture and air penetration while maintaining the exposed configuration of the light conversion layer for optimal light conversion efficiency.
Solution Approach 2:
The patent employs a composite multi-layer cover structure with different material properties: the first cover layer provides baseline protection, the second cover layer enhances barrier properties, and the third cover layer (organic material) provides additional protection. This composite structure achieves superior moisture and air barrier performance compared to single-layer covers, thereby protecting the light conversion layer while maintaining its functional exposure.
2Ease of manufacture
If the side surfaces of the low refraction layer are left exposed to simplify manufacturing, then manufacturing complexity is reduced, but light leakage occurs and display quality deteriorates
Solution Approach 1:
The patent uses conformal thin film deposition to create cover layers that precisely follow the contours of the low refraction layer's side surfaces. This approach provides complete optical coverage to prevent light leakage while maintaining manufacturing simplicity, as the conformal deposition process automatically adapts to the underlying structure's geometry without requiring complex masking or alignment steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the durability and display quality by preventing light leakage and moisture-induced deterioration, thereby extending the lifespan and performance of the display apparatus while maintaining effective light conversion and image quality.
Implementation Method 1
The optical member includes a low refraction layer, a first cover layer, and a light conversion layer. The low refraction layer is on a light output surface of the light guide member and includes side surfaces.
Implementation Method 2
The light conversion layer is on the first cover layer. The light conversion layer is configured to covert a wavelength band of incident light.
Data Source
AI summary
A display apparatus includes a light source, a display panel, a light guide member, and an optical member. The light source is configured to generate light. The display panel is configured to display an image. The light guide member includes at least one surface adjacent to the light source. The optical member is between the light guide member and the display panel. The optical member includes a low refractive layer, a first cover layer, and a light conversion layer. The low refractive layer is on a light output surface of the light guide member and includes side surfaces. The first cover layer is on the low refractive layer and surrounds at least a portion of the side surfaces of the low refractive layer. The light conversion layer is on the first cover layer and is configured to covert a wavelength band of incident light.